diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 965b39a..36d7cc1 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1399,7 +1399,7 @@ function theme_get_setting($setting_name, $theme = NULL) {
       // flush, forcing browsers to load a new copy of the files, as the
       // URL changed.
       try {
-        $query_string = state()->get('system.css_js_query_string') ?: '0';
+        $query_string = \Drupal::state()->get('system.css_js_query_string') ?: '0';
       }
       catch(Exception $e) {
         $query_string = '0';